bourleaux



July 17, 1928. 1,677,467

F; BOURLEAUX FURNACE FOR HEATING RIVETS BY MEANS OF OXYGEN AND ACETYLENE GASES Fi 1927 2 Sheets-Sheet 1 Jul 127, 1928. 1,677,467

. F. BOURLEAUX FEIRNACE FOR HEATING RIVETS BY MEANS OF OXYGEN AND ACETYLENE GASES Filed Feb. 5, 1927 2 Sheets-Sheet 2 Patented July 17, 1928.

UNITED STATES PATENT OFFICE.

FEBNAND BOURLEAUX, OF ST.-QUENTIN, FRANCE.

FURNACE FOR HEATING RIVETS BY MEANS OF OXYGEN AND ACETYLENE GASES.

Application filed February 5, 1927,- Serial No. 166,230, and in France February 22, 1926.

This invention relates to improvements in furnaces for heating rivets for use in riveting, the object of the invention being to provide an improved furnace adapted for the employment of a flame of oxygen and acetylene, for heating the rivets and which is simple in construction, is efficient and rapid in operation and may be very economically used.

With the above and other objects in view, the invention consists in the construction, combination and arrangement of devices hereinafter described and claimed.

In the accompanying drawings- Figure 1 is an elevation, partly in section, of a rivet heating furnace constructed and arranged in accordance with my invention.

Figure 2 is a plan of the same.

Figure 3 is a transverse sectional view of 20 the same, on a larger scale, on the plane indicated by the line aa, of Figure 1.

Figure 4 is a plan of a modified form of the furnace with which a double burner is employed.

Figure 5 is a detail sectional View, partly in elevation, showing the lower half of a sextuple burner. a

Figure 6 is a detail plan partly in section of a form of burner for use in connec- 30 *tion with my improved furnace and in which a single plug is employed for the control of the oxygen and acetylene gases.

Figure 7 is a perspective of the tips of the same, i

The walls of the furnace 1 are of refractory material covered on the outer side by sheet steel 2. The inner capacity is reduced in orderto form two lips 5 which divide the furnace into two chambers 8,- 4, the lower 4 chamber 3 being kept at high temperature for intense heating of the shanks Q, of the rivets, and the upper chamber 4 receiving heat at lower. temperature for heating the heads of the rivets.

The arch 6 covering the upper chamber is shorter than the lower portion of the furnace and its ends are spaced from the ends of the furnace so that the rivets at the extremities of the furnace are uncovered.

Hence the feeding of the furnace with rivets and the outlet of the burnt gases are facilitated.

Two counter plates or slides 7 of steel support the heads T of the rivets. Said plates have transverse oblong slots and buttons .8 which permit transverse adjustment of the plates to vary the width of the space between them according to the size of the rivets.

The furnace is inclined at an angle of about 35 to 45, so that the rivets descend by gravity. At the upper end 9 of the furnace a box containing the rivets may be attached to facilitate feeding of the. rivets. The furnace hence operates as a tunnel furnace with progressive movement of the rivets therethrough.

The furnace is supported by trestles 10 and is inclined longitudinally at any desired angle.

To prevent casual detachment of the foremost rivet R the slides are drawn slightly closer together at their front extremities.

At 11 a box for mixing oxygen and acetylene gases is provided, these gases entering through their respective conduits of admission 12, 13. The smoke or combustion gases developed by the blow pipe pass under and through the covering arch 6 and are discharged at the upper end thereof.

The rivets are gradually heated as they advance in the tunnel furnace, from the moment they are introduced at the extremity 9 upon the slides 7, up to the moment they arrive at the lower extremity of the furnace. means of pincers A, the rivets R being heated to white heat.

At 14 a known device is provided for arresting instantaneously the heating of the oxy-acetylene blow pipe as soon as the opcr ator places his pincers A on the support 14, and the furnace is immediately restarted in operation as soon as the pincers are withdrawn from their support.

The efficiency of the plant may be improved in case ofthe use of a burner with a plurality of nozzles or taps. According to the example shown in Figure 4, a feeding burner 21 isplaced in the longitudinal axis taps 22 toward the rivet to be heated,

. The feeder 21 can lead the mixed gases admitted through a tube 23 connected to the mixer 24, to two, four or six taps. The taps are arranged to converge in a horizontal plane (Figure 4) in order to envelop the rivet with their flames and are disposed in vertical planes (Figure 5) in order to direct their flames along the whole height The operator withdraws them by 'of the furnace and directs two converging of the rivet. The sextuple burner shown in Figure 6 is adapted for use in heating the longest rivets. i

Said burner 25 presents a heating surface 26 having two slits 27, 28 through whichthe gases pass. The ignited gases lick the rivet R, which is hence completely: en-

veloped by the flames.

I nozzle 32, and at the other part in a fluid vein of great velocity through the central conduit 31 leading to nozzles 31" and 32. Hence the gases are agitated and intimately mixed in the nozzle 32 prior to arriving through the tube 23 at the burner 25.

The height of the heating surface 26 and the lengths of the slits 27 and 28' depend on the length of the rivet to be heated. V In. the same way,.the distance between the slits 27, 28 and,.consequently, the width of the heat- 1 ing surface, arev inproportion to the di' ameter of the rivet.

The burner thus constituted produces two flames which rapidly heat the rivet along its whole height.

It will be noted that the angles or bends in the device are. suppressed to a great extent, the charging losses being thereby diminished so that the pressure and eflectiveness of gases is increased.

The burners may be made of copper, cas metal, steatite, or any other suitable refractory substance. I

It is to be understood that modifications could be providedwith regard to the furnace as well as to the burners as described, principally in accordance with the conditions of utilizationof the furnace, with the diameter of the rivets to be treated andso on, without departing from the spirit of the invention and within the scope of the appended claims. a

What I claim is: 1. In a furnace for heating rivets, a tun nel-furnace, means to introduce rivets into the same at one extremity thereof and an oxy-acetylene blow pipe at the other exblow pipe at the lower extremity thereof, means to admit rivets into the furnace at. the other extremity thereof, a lower chamberv in the tunnel to reeeive'the shanks the rivets, an upper chamber to receive the heads of the rivets, whereby a higher temperature by said blow pipe is securedinthe lower chamber than in the upper chamber.

-11 In a furnace for heating rivets, aninclined tunnel-furnace, an oxy-acetylene blow pipe at the lower extremity thereof, an. upper chamber in said tunnel for the heads of the rivets, a lewer chamber in said tunnel for the shanks of the rivets, and a partial top cover for the upper chamber.

5. In a furnace for heating rivets, an inc ined tunnel-furnace, separate chambers in the same for the heads and tails of the rivets, oxy-acotylcne flames at the lower'ex tremity of the tunnel, a partial top for the upper chamber receiving the heads of the rivets, and adjustable trestles for the fur: nace to regulate its height and inclination.

6. In a furnace for heating rivets, atun' nel-furnace, means to regulate its height and inclination, two chambers in the tunnel respectively for the heads and shanks of'the rivets, adjustable slides on the. bottom: of

the upper head. receiving chamber, to adapt the furnace to different sizes of rivets, and

an 'oxy-acetylene blow pipe arranged. to dis- 7 charge into the lower end of the'said lower chamber. V

'Z. In a furnace for heating rivets, attunnel turnace, means to regulate its height and inclination, chambers in said furnace respectively for the heads and shanks of the rivets, oxyacetylene burners-to envelop the rivets with their flames, and means to superpose in case of emergency'a plurality of burners to secure the surrounding of the wholerivet with the flames.

In witness whereof I aflix my signature.

FERNAND BOURLEAUX 

